... water level control valve 1,Size:2"-13"control valve 2,DN: DN15-DN200 3,Materials:ceramic 4,Certificates:ISO9001 Ceramic water level control valve ... Standards: 1,Material: lining ceramic/ body carbon steel + stainless steel2,DN: DN15-DN2003,PN: PN1.6-4.0MPa4,Suitable Temperature ... , thermal insulation, and small thermal expansion.3, The manufacture of the ball uses advanced ...